The TS940 came in the
middle of the eighties as a successor of the TS930 on the market.

The receiver has a frequency range
from 0,1 to 30 MHz. For all modes of operation (single-sideband modulation
LSB, USB - telegrafie CW - amplitude modulation AM - frequency modulation
FM - digital modes of operation the FSK) the TS940 effective filters those
could have as required been adjusted. There is two VFO's, 40 storage
locations, a clock as well as SSB Slope Tune and CW VBT (super).

The transmitter has a transistor
output stage with adjustable power output to 100Watt and a self seeking
tuner. In the construction as High ending equipment is this Transceiver
today still likes and, depending upon equipment (filter assembly,
Antennentuner, condition), used around 800 euro is acted.

The transmission amplifier
FL-2277 von Yaesu is a tube amplifier with two tubes of the type 572B, and the
direct forerunner of the well-known FL-2100 output stage. They are identically
constructed in many ranges. The 2277 1973 of Sommerkamp came on the market.

Volumes - 10m - 15m - 20m - 40m -
80m.

Treasury rate - 70 Watts of max.

Transmitting power - 600 Watts of
max. with 2400 V anode voltage. Lately Chinese tubes are 572B on the market...
Caution! These are examined by the manufacturer only with 1000Volt.

The amplifier can be operated
over foot switches with something absorption in the RX (to hear by the tubes) or
by means of control line by the Transceiver (to have faster relays to be then
inserted) also fully QSK.

He can adapt
symmetrical and asymmetrical antennas on all HF bands. It has an
inserted SWR meter, power indication to 500 Watts and an inserted
quadruple antenna changeover switch.

SHORT
WAVES - ANTENNAS

With
the selection of the antenna first the location is the center of
attention. How do I have much place available? How is the land
development in the direct near field? Next the question of cost places
itself. A commercially manufactured antenna does not have to be more
expensive always than the self's building. The self's building offers
itself with the building of wire antennas. One does not have to again
invent the wheel here, it gives a multiplicity of established antennas.
Here, in germany, "Rothammels Antennenbuch" is mentioned as
standard work. In each case the effectiveness of the antenna system
decides on successes in the short wave radio.

If one would like to
cover the entire high-frequency in the outdoor enterprise with an
antenna, one should use the Doppelzepp or the current sum antenna. These
horizontal dipole antennas become with a symmetrical feeder (chicken
leaders) and a antenna antennen-Tuner excited. The antenna length
amounts to approx. 40m, the feed should with 20m height lie. One does
not know the antenna will so highly attach it on the deep frequencies to
the steep emitter. For European traffic still another structure height
of 10m is sufficient. The antennas can be developed also as Inverded Vee.
The dipole thighs should however at least be highly fastened to the ends
2,5m.

Due to my location in
Berlin I was to be built forced an antenna under the roof. The assembly
has however the advantage of the maintenance-free operation. Old
building, timber roof, 5. Floor. The wire antenna system as loop offers
here a large advantage compared with a long dipole antenna, the house
QRM is less. I think that the closed loop is better against static
loadings. On 40 meters and in DX traffic the loop antenna offers better
field strengths at the signal-strength meter. However this antenna has
also strong lobes on the high frequencies toward Asia and the The West
Indies. In order to adjust the losses toward South America and Africa, I
built still three mono band antennas. For 15 and 20 meters horizontal
dipoles and for 10 meters a vertical dipole. On 80 meters the loop
antenna is through by the antiresonant circuit only one makeshift,
sufficient for Europe QSO's however. As inlet for the loop I use a
doubly led coaxial cable with 93 ohms result in 186 (~200Ohm) with a
length of 12.5 meters. All cables can be laid in such a way within the
house, which does not go with open chicken leader.

Against "HF in shak"
one makes do best with a coat line trap. This is switched directly after
the transmitter exit into the antenna inlet. Andreas, DL7AUY attached
such a part. Ferrite single-aperture cores, from remainder postpost
remainder posts, are pushed on a length of 30 cm onto a piece of RG-58
coaxial cables. Over the ferrites a plastic pipe is fastened. The cable
ends are with POLARIZE plugs provided.